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    copied!<p>Use a factory:</p> <pre><code>public class ImageFactory { Dictionary&lt;Type, Func&lt;IPerson, Image&gt;&gt; _creators; void Assign&lt;TPerson&gt;(Func&lt;IPerson, Image&gt; imageCreator) where T : IPerson { _creators.Add(typeof(TPerson), imageCreator); } void Create(Person person) { Func&lt;IPerson, Image&gt; creator; if (!_creators.TryGetValue(person.GetType(), out creator)) return null; return creator(person); } } </code></pre> <p>Assign factory methods:</p> <pre><code>imageFactory.Assign&lt;Man&gt;(person =&gt; new Image("Man"); imageFactory.Assign&lt;Woman&gt;(person =&gt; new Image("Big bad mommy"); imageFactory.Assign&lt;Mice&gt;(person =&gt; new Image("Tiny little mouse"); </code></pre> <p>And use it:</p> <pre><code>var imageOfSomeone = imageFactory.Create(man); var imageOfSomeone2 = imageFactory.Create(woman); var imageOfSomeone3 = imageFactory.Create(mice); </code></pre> <p>To be able to return different images for men you can use a condition:</p> <pre><code>factory.Assign&lt;Man&gt;(person =&gt; person.Age &gt; 10 ? new Image("Man") : new Image("Boy")); </code></pre> <p>For clarity you can add all more complex methods to a class:</p> <pre><code>public static class PersonImageBuilders { public static Image CreateMen(IPerson person) { if (person.Age &gt; 60) return new Image("Old and gready!"); else return new Image("Young and foolish!"); } } </code></pre> <p>And assign the method</p> <pre><code>imageFactory.Assign&lt;Man&gt;(PersonImageBuilders.CreateMen); </code></pre>
 

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